Problem:

I get “no suitable method found to override” errors when I mole system.dll.

Solution:

Modify the System.moles file in your project and exclude everything except the types you are trying to mole.

Explanation:

I was trying to mole the SerialPort class in System.IO.Ports. After adding the mole for System.dll I began to get “no suitable method found to override” errors. To resolve this issue I simply double clicked the System.moles file to open it in my IDE. Then I modified the file so that moles were created only for the types under System.IO. Change System.moles from this: